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Rifles, Reloading, Optics, Equipment
Reloading
Shoulder bumping
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<blockquote data-quote="Marine sniper" data-source="post: 2346596" data-attributes="member: 4768"><p>Couple thoughts:</p><p></p><p>I have tested SB related to accuracy extensively, and while it sounds good to have as little as possible- it is entirely irrelevant for anything less than bench rest accuracy. I am as anal as anyone when it comes to things like this and my primary hunting rifle (a custom 338 Ackley Lapua with a 40* shoulder is set at .0045 to .005 SB.</p><p></p><p>The proof of the irrelevance of SB being at all related to accuracy is how often do you have fire forming loads that are really accurate? It is silly to be worried about the difference between .002 or .005 jump when fireforming loads sometime have .200+ jump. Is there any other part of reloading where such huge spreads can still result in very good accuracy? Nope.... </p><p></p><p>Number of firings on brass will change SB slightly (even after FL sized) freshly annealed will be more consistent because of the work hardening someone else mentioned. </p><p></p><p>More so than SB / annealing effects neck tension which has more influence on accuracy than SB. </p><p></p><p>To measure the actual SB properly you need to remove the firing pin and ejector. Removing these pieces is also the only way to know your actual bullet jump.</p></blockquote><p></p>
[QUOTE="Marine sniper, post: 2346596, member: 4768"] Couple thoughts: I have tested SB related to accuracy extensively, and while it sounds good to have as little as possible- it is entirely irrelevant for anything less than bench rest accuracy. I am as anal as anyone when it comes to things like this and my primary hunting rifle (a custom 338 Ackley Lapua with a 40* shoulder is set at .0045 to .005 SB. The proof of the irrelevance of SB being at all related to accuracy is how often do you have fire forming loads that are really accurate? It is silly to be worried about the difference between .002 or .005 jump when fireforming loads sometime have .200+ jump. Is there any other part of reloading where such huge spreads can still result in very good accuracy? Nope.... Number of firings on brass will change SB slightly (even after FL sized) freshly annealed will be more consistent because of the work hardening someone else mentioned. More so than SB / annealing effects neck tension which has more influence on accuracy than SB. To measure the actual SB properly you need to remove the firing pin and ejector. Removing these pieces is also the only way to know your actual bullet jump. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Shoulder bumping
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